EP4331833A1 - Tiled part with adhesive bond on a densified concrete base, ten or more of concrete bases with adhesively bonded plate parts and method for their production - Google Patents

Abstract

The invention relates to a plate part (1) which is adhesively bonded to a compacted concrete base (2). In order to provide an advantageous plate part that sits on a concrete base and is adhesively bonded to it, it is proposed that the concrete base (2) has a density of 0.8 kg/dm³ or more, with the adhesive layer (10 ) has an amount of 400g/m² or more, up to 1300 g/m², and the adhesive is further silane modified. The invention further relates to a number (A) of ten or more mass-produced concrete bases (2) with adhesively bonded plate parts (1) sitting thereon. The invention also relates to a method for producing a concrete base (2) which is adhesively bonded to a plate part (1), wherein the concrete base (2) is first produced with an upper side (3), an underside and edge sides (4), then on the upper side ( 3) adhesive is applied to the concrete base (2) and then the plate part (1) is placed centered on the concrete base (2), with each plate part (1) being individually centered on each concrete base (2).

Description

field of technology

The invention initially relates to a plate part that is adhesively bonded to a compacted concrete base.

The invention further relates to a number of ten or more mass-produced concrete bases with adhesively bonded plate parts sitting on them.

The invention also relates to a method for producing a concrete base that is adhesively bonded to a plate part, wherein the concrete base is first produced with a top, a bottom and edge sides, then adhesive is applied to the top of the concrete base and the plate part is then placed centered on the concrete base, whereby each plate part is individually centered on each concrete base.

State of the art

Plate parts, especially those that are adhesively bonded to a concrete base, are known. These are used, for example, in the creation of terrace floors or the like. The plate part forms the visible and correspondingly walkable or drivable surface, for example a terrace area.

What is known in this context is a ceramic plate that is adhesively bonded to a compacted concrete base, as well as a method for producing it, in which the ceramic plate is adhesively bonded to the concrete base, for example from DE 10 2017 111 248 A1 . From this it is further known to apply an adhesive to the surface of the produced and compacted concrete base facing the later upper side, after which the ceramic plate is placed on the adhesive surface and is preferably attached to the concrete base under pressure.

Summary of the invention

With regard to the prior art described above, the invention has the task of providing an advantageous plate part that rests on a concrete base and is adhesively bonded to it and also an advantageous manufacturing method for the connection of a plate part with a concrete base. In addition, there is the task of specifying a production-technically favorable production of a series number of ten or more concrete bases with adhesively bonded plate parts sitting on them.

A possible solution to the problem is, according to a first inventive concept, a concrete base with an adhesively bonded plate part, in which it is intended that the concrete base has a density of 0.8 kg/dm ³ or more, with the adhesive layer having an amount of 400 g /m ² or more, for example up to 1300 g/m ² , and the adhesive is silane-modified.

It is an automatically produced compacted concrete base with a plate part, whereby the automated production begins with the production of the concrete base as such and ends with the final application of the plate part and, if necessary, pressing the plate part. The Compacted concrete base with the plate part can be produced without an individual operation that would have to be carried out by human hands or individually controlled. A possible production is explained in further detail below.

With regard to the production of a number of ten or more concrete bases with plate parts, it is proposed to solve the problem that the plate part is centered relative to the concrete base in such a way that in all of the above-mentioned mass-produced concrete bases with adhesively bonded plate parts resting on them, there is a right-angled distance between the edge edges of the Plate parts and the concrete base does not exceed 2/10 mm.

This, too, is, in the same way as explained above with regard to a concrete base adhesively bonded to a plate part, an automatic manufacturing process without human intervention with regard to an individualized work process.

In terms of method, the object is achieved according to a further inventive idea in that the plate part is detected with an automatic handling machine, such that a centered alignment of the plate part to a holding device of the handling machine is achieved, so that the concrete base is formed on a movable receiving plate at a predetermined location on the receiving plate is that the receiving plate with the concrete base is moved into an assembly position in which the plate part is placed on the concrete base, and that further the holding device of the handling machine is aligned with the actual position of the respective concrete base before placing the plate part.

This, too, is, in the same way as explained above with regard to a concrete base adhesively bonded to a plate part, an automatic manufacturing process without human intervention with regard to an individualized work process.

The concrete base with an adhesively bonded plate part in one of the embodiments described here in further detail and/or the number of ten or more concrete bases with plate parts in one of the embodiments described here can be achieved in particular with the aid of a method for producing a concrete base that is adhesively bonded to a plate part in one of the be manufactured in the configurations described here.

The adhesive used can accordingly be a so-called SMP or MS polymer adhesive, which essentially has a silane-modified polymer as the base material. This is more preferably a one-component adhesive, with the polymers used mostly consisting of a polyether with silanized end groups.

This is also a butadiene- and/or polyurethane-free adhesive with a relative density of, for example, about 1.4 to 1.75 g/cm ³ , more preferably about 1.5 to 1.65 kg/cm ³ , and a possible tensile strength according to ISO 37 in the hardened state of, for example, approximately 2 to 3.5 MPa (or N/mm ² ), more preferably approximately 2.5 MPa (or N/m ² ).

Silane-based or silane-modified adhesives have high temperature resistance from -40C° to 120C° and good adhesion to both smooth and porous surfaces.

In one possible embodiment, an adhesive recipe is provided which can essentially be composed as follows (in% by weight - preferred values/value ranges in brackets): Polymer (e.g. polyether) 15 to 50 Filler (e.g. calcium carbonate, expanded glass, etc.) 30 to 60 Vinyltrimethoxysilane (or also referred to as trimethoxyvinylsilane) 0.5 to 5 (1 to 2.5) UV stabilizer 0 to 2 (0.1 to 1) Ethyl ester (e.g. tetraethyl silicate) other additives (e.g. diluents, 0 to 2 (0.1 to 1) adhesion promoters, catalysts and/or colorants) 2 to 20

The concrete base is preferably present with a comparatively high density. This is preferably more than 0.8 kg/dm ³ up to, for example, 2.7 kg/dm ³ or more, more preferably about 0.8 to 2 kg/dm ³ for so-called lightweight concretes and about 2.6 kg/dm ³ or more in the case of so-called heavy concretes, whereby the high density achieved here can be achieved by using a relatively heavy aggregate, such as, for example, consisting of or containing at least a significant proportion of magnetite, iron ore, barite or barite. In this regard, a so-called normal concrete with a density of approximately 2 to 2.6 kg/dm ³ is also possible.

The compression can be achieved, for example, by a knocking device. Alternatively, a shaking device or vibration compaction can also be provided.

In principle, the concrete used can be closed-pored concrete. Alternatively, an open-pored concrete can also be used, so that the concrete base produced can have a certain porosity.

In one possible embodiment, a concrete recipe is provided which, in terms of solids content alone, can be composed as follows (in mass percent (M%) - preferred values/value ranges in brackets): Strength class cement 8 to 13 (approx. 11) ink pen 2 to 3 (approx. 2.5) Sand with a grain size of 0/2 40 to 45 (approx. 43) Gravel with a grain size of 2/8 20 to 30 (approx. 26) Stone chips with a grain size of 2/8 15 to 20 (approx. 17.5) Water cement value 0.3 to 0.4 (approx. 0.38)

The preferred amount of adhesive of 400 g/m ² or more preferably refers to the moment of adhesive application, ie without taking into account any weight reduction that may occur afterwards, including in the course of the drying process, for example due to vapor diffusion. Advantageously, by using a silane-modified adhesive, a change in volume after curing of preferably less than 3% can be determined.

With regard to the water-cement value, there may also be a range that goes beyond the above. The lower value can also range, for example, up to 0.25 and the upper value up to 0.65.

During the course of production, the initially created concrete base preferably still has a moisture content at the moment the adhesive layer is applied from 3.4 M% (mass percent) or more up to 4.0 M%. The corresponding (residual) moisture in the concrete contributes in an advantageous manner to the favorable setting of the adhesive layer. The curing of a silane-modified adhesive, as used according to the invention, is positively supported by the moisture present, with the release of alcohol (methanol).

From a procedural point of view, an immediate sequence of the manufacturing steps "manufacture of the concrete base", "application of the adhesive to the concrete base" and "placement of the plate part" is preferred, which allows the moisture content mentioned to be achieved solely through the previous production of the concrete base. Alternatively or additionally, moistening can also be provided on the corresponding surface of the concrete base before the adhesive is applied. Humidification can be done, for example, by spraying with water.

The creation of the concrete base can initially be carried out independently of the plate part and can accordingly be carried out in a usual manufacturing process, as is known, for example, for paving stones or the like. The adhesive layer is applied to an upper side of the concrete base, in particular with an amount of approximately 400 g/m ² or more, for example up to 1300 g/m ² , more preferably 500 to 1200 g/m ² , at the moment of application.

The concrete base is preferably a cubic body with a rectangular base. Concrete bases that have corresponding long and narrow sides are preferred. But it can also be a square base area. Furthermore, the concrete base has a dimension which essentially corresponds to the base area and essentially in plan view congruent top side. The concrete base also has the base area and the edge surfaces connecting the top. With regard to the specified substantial correspondence, spacing projections can also be formed on the edge surfaces. The edge surfaces are formed as essentially vertical surfaces. A height of the edge surfaces, which is preferably the same all around, is more preferably 1/20 to 1/10 of the length of an edge of the base surface or the top. The base area has four longitudinal edges.

The adhesive application can be carried out in a caterpillar manner, whereby at the moment of application a distance can be maintained between the caterpillars in a direction transverse to the longitudinal extent of the caterpillars. Furthermore, the adhesive can be applied in a meandering bead shape to the surface of the concrete base. An adhesive layer that is closed at least circumferentially, assigned to the edge sides, is preferred, at least when the plate part is ultimately applied and, if necessary, pressed on again. In this case, an application of a single linear adhesive bead, which has an edge-parallel bend at its beginning and end associated with an edge side, can also be assumed, and the closed shape can be achieved by applying several such adhesive beads together or subsequently.

When producing a number of ten or more, for example up to twenty or fifty or more, concrete bases with plate parts sitting on them and adhesively connected to them, the plate part is arranged and aligned for all concrete bases of the same number produced in such a way that overall there is a uniform laying pattern Concrete base provided with the plate parts can achieve this number.

The proposed manufacturing method also ensures that the edge edges of the plate parts, when aligned essentially parallel to the edge edges of the respectively assigned concrete base, run at a distance of at most 2/10 mm from the concrete base edge edges, viewed at right angles to the course of the edge edges. This maximum distance is maintained for all concrete bases of this selected number provided with plate parts.

In this regard, a distance of less than 2/10 mm is preferred, more preferably less than 1.5/10 or less than 1/10 mm.

The edge of the concrete base is generally spaced outwards from the edge of the plate part, so that the plate part cannot protrude beyond the edge of the base.

An automatic handling device, for example an industrial robot, can be used for production, by means of which individual centering and arrangement of each plate part on the assigned concrete base can be achieved.

The concrete base can, as preferred, be produced (cast and compacted) on a movable receiving plate and at a predetermined location on the receiving plate. After the concrete base has been manufactured, it can be moved using the receiving plate into a position in which the associated plate part can be placed after applying the adhesive layer using the automatic handling machine.

The receiving plate has a known size for the automatic handling machine. It also preferably has a rectangular floor plan. The recording plate will continue to be moved along a predetermined path that is also known to the handling machine. It can be a process on rails or along a precise, preferably linear guide. The receiving plate is stopped at a predetermined point on a travel path in order to apply the plate part to a concrete base. Several, for example two, four, six or more, concrete bases are preferably applied to a receiving plate. Even if the concrete bases on the receiving plate are formed on basically predetermined surfaces, there can still be a difference in position from the position of a concrete base expected by the handling machine, which can be caused by various reasons. On the one hand, the receiving plate may not be stopped exactly at the predetermined location; on the other hand, for example, a slight relative displacement to the receiving plate may have occurred during the formation of the concrete base. This results in the need to achieve a centered alignment of the plate part relative to the concrete base in each individual case.

The automatic handling machine advantageously has a holding device, which can preferably be aligned together with the plate part held thereon and to be placed relative to the automatic handling machine as such, whereby an individual and exact alignment of the plate part to the concrete base can be achieved. Even in the case that, for example, the concrete base is not positioned exactly on the receiving plate, for example shifted by a few millimeters compared to a target position and / or rotated by a few degrees about a vertical axis, the proposed method ensures a centered arrangement of the plate part on the top of the concrete base.

The automatic handling device or the holding device is designed to record the exact position of the concrete base and to adjust the alignment of the holding device with the plate part.

First, the plate part is picked up by the holding device. For this purpose, the plate part is kept ready at a specific location and in a specific orientation for detection by the automatic handling machine. The location can in particular have a centering gauge into which the plate part is placed, which can be oriented, for example, on two edge edges of the plate part. In any case, with respect to these two edge edges, for example, there is a defined position of the plate part for the automatic handling machine. Due to the defined position of the two edge edges mentioned, for example, the defined position with respect to the two further edge edges also results immediately. Such a centering gauge can further preferably be formed on a surface that runs obliquely to a horizontal. A perpendicular of the surface encloses an acute angle with a vertical. This means that the plate can rest in the centering gauge with the support of weight.

Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 and / or one or more of the further independent claims or with features of further claims. However, they can also be of significance in an assignment to only individual features of claim 1 and/or one or more of the further independent claims or the respective further claim or each independently.

The adhesive layer is preferably designed to be closed all around, at least in its outermost position. It is formed so close to the edge that there is no squeezing of adhesive beyond the edge even after the pressurization of the placed plate part, which is preferably carried out further. The surface areas that may not be completely covered with adhesive are preferably provided towards a central region of the surface.

The adhesive layer can, especially in the hardened state, cover the area covered by the plate part on the concrete base to approximately 80% or 85% or more. Accordingly, even in the state of use of a concrete base provided with a plate part, adhesive-free areas with an area proportion of 20% or less can arise in the plane of the adhesive application.

The adhesive layer in the hardened state and thus in the usual state of use of the concrete base provided with the plate part can have a thickness of less than 5 mm up to 0.5 mm, viewed perpendicular to the surface extent of the adhesive layer or the visible layer of the plate part. A range between 0.5 mm and 2 mm is preferred, more preferably between 1.0 mm and 1.5 mm. It may also be the case that the thickness varies across the surface that is bonded. There may be a smaller thickness at the edge than in a central area of the surface. This means that a certain degree of bowling of the ceramic plate can be taken into account if necessary. The thickness can vary depending on the surface quality of the concrete base, i.e. also depending on the type of concrete (lightweight, normal or heavy concrete), as well as on the lower surface of the plate part facing the adhesive layer over the entire adhesive surface. For example, the adhesive layer can have a thickness of, for example, 4.8 mm in some areas, a thickness of, for example, only 2.3 or 3.4 mm in another area, and a thickness of, for example, 1.3 elsewhere or 4.5mm. In addition, thicknesses can even result that are zero or almost zero, especially in areas in which, due to the respective surface properties, the top of the base and the bottom of the plate part can partially lie directly against one another. In addition, the thickness of the adhesive layer can be zero or almost zero in areas in which neither adhesive has been applied to the top of the base nor in which adhesive has been distributed during the placement of the plate part, in which areas there are also adhesive-free cavities can result.

The plate part can consist of a ceramic material, alternatively of a plastic material, such as a vinyl plastic or a PVC plastic. Plastic plate parts prove to be advantageous in that the covered area of the adhesive layer can be smaller compared to bonding ceramic plate parts. Due to the high stability of the plastic plate parts, even when laying the concrete base provided with them in the usual way, during which laying also involves hitting the plate part on the concrete base with a rubber hammer or similar, comparatively larger adhesive-free areas between the plate part and the concrete base do not lead to cracks in the plate part.

If the plate part is designed as a ceramic plate, it can have a structure on the underside, for example a rib-like structure or a cross-shaped rib structure. The assigned top side of the concrete base is preferably formed without molding this structure. In a preferred embodiment, due to the manufacturing process alone, there is no or practically no negative structure on the facing concrete base top that is adapted to the possible structured underside of the plate part. The adhesive layer is preferably formed with such a thickness that the adapted negative structure does not result.

A splitting tensile strength according to DIN EU 1339 between the concrete base and the plate part of approximately 4 N/mm ² or greater can also preferably be provided. In a preferred embodiment, the splitting tensile strength can be up to approximately 7 N/mm ² , more preferably approximately 6 N/mm ² .

Furthermore, when the adhesive layer is applied to its upper side that receives the adhesive layer, the concrete base can already have a partial setting, while underlying areas of the concrete base are less or not yet set. Accordingly, a skin formation can occur on the upper side that receives the adhesive layer due to partial setting, so that a more stable, firmer base results for the adhesive and the attached panel part than with freshly formed concrete. This helps to avoid the undesired molding of a structuring that may be formed on the underside of the plate part in the concrete. In a preferred embodiment, the areas underneath the skin are bound at least to such an extent that the concrete base has sufficient stability for further processing, such as applying the adhesive layer and placing the plate part.

The adhesive can, as preferred, be applied in a pasty, stable consistency. In this regard, a gel-like adhesive may be present, which may only be distributed (if necessary evenly) on the top of the concrete base when the plate part is placed in place by the weight of the plate part acting here. The freshly applied adhesive preferably does not run.

After the plate part has been placed, it can also be pressed against the concrete base. Here, the plate part is loaded with a predetermined contact pressure towards the top of the concrete base provided with the adhesive layer in order to further increase the adhesive effect. This pressure can occur immediately after placing the plate part on the adhesive layer. The receiving plate with the concrete base and plate parts resting on it is preferably moved to a further station in which the pressing is carried out.

The pressure can also be applied by, for example, driving over the top of the plate part using a pressure roller.

The force applied here for pressing can, as preferred, be approximately 5,000 to 9,000 N/m ² , more preferably between 7,000 and 8,000 N/m ² , and more preferably approximately 7,500 N/m ² . The pressing system used can, for example, apply a force of 120,000 to 160,000 N.

The edge lengths of the concrete base, as well as the plate parts that are adhesively bonded to it, can be, for example, 400/800 mm, 800/800 mm, 600/600 mm or even 600/300 mm. Other, correspondingly smaller or even larger, dimensions or intermediate values are also possible in this regard.

The holding device of the handling machine can be adapted in terms of its floor plan design to the floor plan design of the plate part to be picked up. In the case of a plate part which is rectangular in plan, the holding device is also preferably designed to be rectangular in the area of its holding surface which interacts with the plate part for holding purposes, although in this regard there may well be an excess of the mounting surface compared to the partial plate surface.

According to a preferred embodiment, the holding device is designed as a vacuum holding device. For this purpose, the automatic handling device can have a vacuum pump or the like that can be activated or deactivated or can be connected to one. Suction openings are provided in the holding surface of the holding device, via which a negative pressure can be achieved between the holding device and the plate part.

For exact and individual centering of the captured and held plate part relative to the concrete base and final placement on the adhesive layer, the holding device can be released on the automatic handling machine and is horizontally displaceable relative to a support head of the handling machine and/or can be rotated about a vertical axis. In a basic orientation from which the triggering takes place, the holding device can be fixed relative to the support head. For example, before or during the alignment of the holding device for centering adjustment, this determination is released.

The possible linear displacement of the holding device relative to the support head can be a few millimeters from a basic position, for example up to 20 mm or more, for example up to 30 or 40 mm. With reference to a cross section through the automatic handling machine, in which cross section the vertical axis is represented as a line, an angle of inclination of a contact plane of the holding device, on which the plate part comes to rest for transport, can be - starting from the basic position - relative to one transverse to the vertical axis running Level of the support head of a few degrees of angle, for example up to 5 degrees or more, for example up to 10 or 20 degrees.

To align the holding device and the plate part arranged thereon, two opposing centering strips can be attached to or associated with the holding device. The holding device can be moved with the help of the centering strips, if the holding device is released within the automatic handling machine to allow movement, and if necessary also rotated in a horizontal plane. For this purpose, the centering strips are supported or fastened to the holding device with regard to a counterforce.

The holding strips can overlap the associated edge of the concrete base like a finger or button. The centering strips can preferably be moved synchronously towards one another, so that when the displaceability and/or rotation is triggered by placing the centering strips on one or both edge sides of the concrete base, the alignment of the holding device together with the plate part can be carried out at the actual position of the concrete base. With support, for example, on an edge of the base, the holding device can be pulled into the correct centering position together with the plate part due to the synchronous inward movement of the centering strips.

Two pairs of such centering strips are preferably provided, which are more preferably movable perpendicular to one another. Using these pairs of centering strips, all four edge sides of the concrete base can be detected or felt. A preferably motor-assisted movement of the respective centering strips of a pair towards one another leads to appropriate Edge side system for automatically centering the holding device with the held plate part.

Such centering using mounting strips is also preferably carried out twice. A first time when the plate part is still held on the automatic handling machine by the described displacement of the holding device relative to the support head, i.e. together with the plate part and then a second time after the plate part is placed on the concrete base or the adhesive layer of the concrete base and that Plate part is detached from the holding device, but the holding strips are still in a corresponding height overlap with the concrete base.

With regard to the disclosure, the ranges or value ranges or multiple ranges specified above and below also include all intermediate values, in particular in 1/10 increments of the respective dimension, and if necessary also dimensionless. For example, the statement 400 g/m ² to 1300 g/m ² also includes the disclosure of 400.1 g/m ² to 1300 g/m ² , 400 g/m ² to 1299.9 g/m ² , 400.1 g/m ² to 1299.9 g/m ² etc., the disclosure of about 4 N/mm ² also the disclosure of 4.1 N/mm ² , or also 3.9 N/mm ² , the disclosure of to to 7 N/mm ² also the disclosure of up to 6.9 N/mm ² etc. This disclosure can, on the one hand, be used to limit a specified range limit from below and/or above, but alternatively or in addition to the disclosure of one or more singular values from one serve the specified area.

Brief description of the drawings

Fig. 1

in schematischer Darstellung den Ablauf eines Verfahrens zur Herstellung eines mit einem Betonsockel klebeverbundenen Plattenteils;

Fig. 2

die Draufsicht gemäß Pfeil II in Figur 1 auf einen hergestellten Betonsockel nach Auftrag einer Klebstofflage;

Fig. 3

in einer schematischen Draufsicht eine Station mit einem Handhabungsautomaten zum zentrierten Aufsetzen eines Plattenteils auf einen Betonsockel, eine Grundstellung betreffend;

Fig. 4

den schematisch dargestellten Schnitt entlang der Linie IV - IV in Figur 3 durch den Handhabungsautomaten, betreffend eine Grundstellung des Automaten;

Fig. 5

den Handhabungsautomaten in einer schematischen Schnittdarstellung quer zu der Schnittebene der Darstellung in Figur 4;

Fig. 6

eine der Figur 3 im Wesentlichen entsprechende Darstellung, betreffend die Aufnahme eines Plattenteils durch den Handhabungsautomaten von einem Plattenteil-Vorrat;

Fig. 7

eine Schnittdarstellung durch den Handhabungsautomaten gemäß der Darstellung in Figur 4, nach Aufnahme und einer ersten Halterung eines Plattenteils an einer Halterungsvorrichtung des Handhabungsautomaten;

Fig. 8

eine Folgedarstellung zu Figur 6, bei Ablage des aufgenommenen Plattenteils auf einem Zentrierungspodest;

Fig. 9

das Zentrierungspodest in einer schematischen Seitenansicht;

Fig. 10

eine weitere Schnittdarstellung gemäß Figur 4, nach Aufnahme des Plattenteils von dem Zentrierungspodest;

Fig. 11

eine Folgedarstellung zu Figur 8, den Aufsetzvorgang des Plattenteil auf den mit einer Klebestofflage versehenen Betonsockel;

Fig. 12 bis 15

Abfolgedarstellungen, jeweils in einem Schnitt gemäß Figur 4, einzelne Schritte zur zentrierten Ausrichtung und Absetzen des durch den Handhabungsautomaten zentriert aufgenommenen Plattenteils auf den mit der Klebstofflage versehenen Betonsockel;

Fig. 16

in schematischer Perspektivdarstellung einen Betonsockel mit einem darauf klebeverbunden aufsitzenden Plattenteil, eine erste Ausführungsform betreffend;

Fig. 17

den schematischen und stark vergrößerten Schnitt entlang der Linie XVII -XVII in Figur 16;

Fig. 18

eine schematische Darstellung gemäß Figur 16, eine zweite Ausführungsform betreffend;

Fig. 19

in schematischer Darstellung eine aus einer unmittelbar aufeinander erfolgten Produktion herausgegriffene Anzahl an mit Plattenteilen versehenen Betonsockel.

The invention is explained below with reference to the accompanying drawing, which only represents exemplary embodiments. A part that is only related is explained in one of the exemplary embodiments and is not replaced by another part in a further exemplary embodiment due to the special feature highlighted there, is therefore also described as a possible existing part for this further exemplary embodiment. On the drawing shows:

Fig. 1

a schematic representation of the process of a process for producing a plate part adhesively bonded to a concrete base;

Fig. 2

the top view according to arrow II in Figure 1 on a prepared concrete base after applying a layer of adhesive;

Fig. 3

in a schematic top view a station with an automatic handling machine for centering a plate part on a concrete base, relating to a basic position;

Fig. 4

the schematically illustrated section along line IV - IV in Figure 3 by the handling machine, regarding a basic position of the machine;

Fig. 5

the handling machine in a schematic sectional view transverse to the sectional plane of the illustration in Figure 4 ;

Fig. 6

one of the Figure 3 Essentially corresponding representation, relating to the acceptance of a plate part by the automatic handling machine from a plate part supply;

Fig. 7

a sectional view through the handling machine as shown in Figure 4 , after receiving and first holding a plate part on a holding device of the automatic handling machine;

Fig. 8

a follow-up presentation Figure 6 , when placing the recorded plate part on a centering platform;

Fig. 9

the centering platform in a schematic side view;

Fig. 10

another sectional view according to Figure 4 , after picking up the plate part from the centering platform;

Fig. 11

a follow-up presentation Figure 8 , the placement process of the panel part onto the concrete base provided with a layer of adhesive;

Fig. 12 to 15

Sequence representations, each in a section according to Figure 4 , individual steps for the centered alignment and placement of the panel part, centered by the handling machine, onto the concrete base provided with the adhesive layer;

Fig. 16

in a schematic perspective view of a concrete base with an adhesively bonded plate part, relating to a first embodiment;

Fig. 17

the schematic and greatly enlarged section along the line XVII -XVII in Figure 16 ;

Fig. 18

a schematic representation according to Figure 16 , relating to a second embodiment;

Fig. 19

a schematic representation of a number of concrete bases provided with plate parts selected from a production that took place directly one after the other.

Description of the embodiments

Shown and described is initially with reference to Figure 1 a method for producing one as in the Figures 16 and 18 Concrete base 2 shown as an example with attached plate part 1.

The plate part 1 is adhesively bonded to the concrete base 2 while sitting on it.

With reference to a floor plan, in which a top side 3, on which the plate part 1 is placed, is represented as a surface, the concrete base 2 has edge lengths which can essentially correspond to the edge lengths of the plate part 1 viewed in the same direction. In the exemplary embodiments, there are edges of the edge sides 4 that run at right angles to one another in the floor plan and have an edge length a, which can correspond to the edge length b, for example (cf. Figure 16 ), or, according to the exemplary embodiment in Figure 18 , approximately 1.5 to 3 times, further for example approximately 2 times the edge length b.

The method first provides for the production of the concrete base 2, for which concrete is filled into a shaping mold 5 according to a predetermined concrete recipe. The filled concrete 6 is compacted using a knocking device 7, for example. Alternatively, vibratory compaction or vibration compaction, and possibly also a hydraulic press for compaction, can also be provided.

The production of the concrete base 2 can, as preferred, be carried out on a movable receiving plate 8, in particular at a predetermined location/area on the receiving plate 8. After compacting the filled concrete 6 and preferably partial setting, the mold can be lifted off to expose the concrete base, for example (see dash-dotted position of the mold in Figure 1 ).

As shown schematically in, among other things Figure 3 shown, several concrete bases 2 can optionally be produced and placed on a receiving plate 8 at predetermined locations on the receiving plate 8.

The concrete base 2, which is partially set at least in the area of the top 3, is preferably fed to an adhesive application device 9 by means of the movable receiving plate 8.

Using the adhesive application device 9, an adhesive layer 10 is applied to the top 3 of the concrete base 2. A silane-based or a silane-modified adhesive is preferably used.

The adhesive application can be carried out according to the schematic representation in Figure 1 via a nozzle or the like, which, preferably secreting pasty adhesive, is moved over the top 3 (cf. Figure 1 , arrow r). It Several nozzles can be arranged next to one another transversely to the direction r. The nozzle preferably moves, for example in zigzag lines, in the direction transverse to the direction r, so that overall a meandering application of an adhesive bead can result (see Figure 2 ).

The adhesive is preferably applied to the top 3 in such a way that it does not (initially) extend completely to the edge edges 35 of the edge sides 4. After the adhesive has been applied, a circumferential edge 11 remains on the top side of the concrete base 2, which is (at least initially) free of adhesive. This is intended to prevent adhesive from oozing out of the adhesive plane outwards beyond the edge sides 4 of the concrete base 2 when the plate part 1 is placed.

The edge 11 can, for example, be approximately half to a full width of an applied adhesive bead, i.e. before the plate part is placed.

Further preferably, the adhesive is applied via a valve arranged, for example on a robot arm, with a distance c of, for example, approximately 5 mm up to approximately 10 or 20 mm being maintained in the edge region of the concrete base 2.

The adhesive, which is preferably applied in a meandering shape, can be applied continuously as a bead with a width e of, for example, approximately 5 to 10 mm, viewed transversely to the direction of travel (arrow r) of the nozzle of the adhesive application device 9, with a width e between two essentially parallel adhesive beads in the direction of the width e considered distance f can remain, which can essentially correspond to the width e of the adhesive bead or less. The adhesive layer 10 is obviously preferably formed as an adhesive bead, with essentially one edge edge of the plate part corresponding length. The adhesive beads preferably run parallel to one another over the entire surface and parallel to such an edge. They are only connected to one another at the turning points associated with the edge edge to which they run parallel, the edge edge running at right angles, which can result from a continuous application of adhesive. This means that an adhesive bead can look like this Figure 2 can be seen, only have two free ends, a starting end and a final end.

How further in Figure 2a shown, the adhesive can also be applied in such a way that it is applied with a nozzle of the adhesive application device 9 assigned to a first edge side 4 starting at a starting point P1 and initially in the direction of a second edge side 4 running at right angles to the first edge side 4 by one Length a1 is moved to a point P2. Further, the nozzle is then moved, preferably without interruption, starting from the point P2 with a change in direction of essentially 90 ° parallel to the second edge 4 to a point P3, which is located near the edge side 4 opposite the first edge side 4 and from there again with a further essentially 90° change in direction, and preferably without interruption, to a point P4. It is further preferred if several, in particular two, such concrete bases are provided on the receiving plate 8 in a series arrangement, that the adhesive discharge from the nozzle for a travel distance which is a distance x between two assigned and essentially parallel edge sides 4 of the successive concrete bases corresponds, is interrupted and then a corresponding procedure and adhesive application is resumed at a point P1 'on the following concrete base.

Using the same nozzle, the adhesive application can then be started again in the same way, starting from a point P5 on the first concrete base under consideration, whereby a point P6 can coincide with the point P1 and a point P7 can coincide with the point P4. But there can also be a distance remaining.

The aim is to produce an adhesive layer that is closed at the edge at any rate at the end of the manufacturing process, preferably after the plate has been pressed onto the concrete base. Certain distances between, for example, points P6 and P4 etc. can also be accepted because this pressing results in a corresponding increase in the width of the adhesive beads. For example, an increase in size of three to five times can occur. For example, such an adhesive bead can have a width of 5 mm after the first application and can accordingly widen, for example, up to 20 mm when pressed.

In this regard, an arrangement can also be made which, with regard to the distance a1, ultimately results in a practically closed layer of adhesive over the entire surface of the concrete base after the plate has finally been pressed onto the concrete base.

An edge distance between the points P1, P3, P5 and P7 etc. to the associated edge side 4 or the adhesive bead between the points P2 and P3 at a distance from the second edge side 4 is preferably chosen so that no adhesive is squeezed out even after the aforementioned pressing beyond the edge side 4. In the example case in which the width is increased from, for example, 5 mm to 20 mm, a geometric center line of such an adhesive bead is, for example, in Distance of 10 mm or more to the first or second edge side 4 is selected.

Such an adhesive application can also be carried out simultaneously with several nozzles arranged in parallel.

With regard to a final adhesive bead Ka parallel to an edge side opposite the second edge side 4, it can be provided, for example, that with regard to this one adhesive bead there is no need for a process parallel to the first edge side 4 starting from the corresponding point P1. The same then applies to the end point, which corresponds to point P3.

The plate parts 1 can be in the form of ceramic or plastic plate parts. These can be present in the area of an assembly station M for individual pickup by an automatic handling machine 12 as a supply V, possibly stacked (see schematic representation in Figure 3 ).

In a subsequent process step, such a plate part 1 is placed with its underside opposite the visible side 13 centered on the top 3 of the concrete base 2 provided with the adhesive layer 10.

For this purpose, a correspondingly provided handling machine 12 can first have a holding device 14, by means of which a plate part 1 can be captured and transported by the supply V. The holding device 14 can have a floor plan area whose dimensions can be essentially adapted to the dimensions of the plate part 1 to be held.

The holding device 14 can, as further preferred, be designed in the form of a vacuum holding device, which is held on a support head 16 of the automatic handling machine 12 in a releasably displaceable manner. In this case, a substantially horizontal displaceability (double arrow g) and/or rotation about a vertical axis x (double arrow h) of the holding device 14 can be provided relative to the support head 16. This can further be achieved, for example, by a plate-shaped holding section 17 with a circular base area in a floor plan in which the vertical axis Figure 4 ).

The holding device 14 is movably mounted on a support head for this purpose, initially, when picking up the plate part and transporting the plate part until the holding device is aligned above the concrete base, with the held plate part at a short distance from the top of the concrete base, rigidly connected to the support head . This, for example, by bracing using a piston/cylinder arrangement Z, which can be actuated hydraulically or pneumatically, for example. This rigid tension is then preferably only released for displacement in the position mentioned, with the held plate at a short distance above the concrete base.

In addition, the holding device 14 or the vacuum holding device can be displaceable in the axial direction relative to a holding head 19 rigidly connected to the holding section 18 (see double arrow k). This displaceability can also be achieved, if necessary, against the force of a spring 20 that provides a return to a basic axial alignment.

The holding device 14 is preferably provided with a negative pressure area 21 which is directed opposite to the support head 16 and therefore usually downwards and is fluidly connected via preferably flexible connecting hoses 22 to a vacuum generator on the support head side or also externally, for example in the form of a piston pump or a blower stands.

By means of the handling machine 12, a plate part 1 is captured from the supply V and held on the holding device 14 in the negative pressure area 21 following a triggered application of negative pressure via the holding device 14.

When a plate part 1 is picked up from the supply V, it can happen, as exemplified in Figure 7 shown that the plate part 1 is not held centered on the holding device 14, for example by an offset placement of the plate part 1 on a supply stack, but rather is offset to one or two sides relative to the holding device 14 and / or rotated about the vertical axis x.

In order to ensure this centered holding of the plate part 1 on the holding device 14, a centering platform 15 can be provided on which the plate part 1 is, preferably fundamentally, temporarily stored. The automatic handling device 12 moves the plate part 1, which may not be held centered on the holding device 14, to the centering platform 15 and places the plate part 1 on it while removing the negative pressure.

The centering platform 15 has an inclined surface 23 which forms an acute angle alpha of, for example, approximately 30 to 45 degrees to a horizontal plane E (cf. Figure 9 ).

The inclined surface 23 has a rectangular or square contour, with a tip 24, which represents the lowest point of the inclined surface 23. In the area of this tip 24, the inclined surface 23 is provided with edge boundaries 25.

By placing the plate part 1 on the inclined surface 23 of the centering platform 15, a (reproducible) defined position and orientation of the plate part 1 results solely depending on gravity, so that the plate part 1 can then be picked up and held again by the holding device 14 of the automatic handling machine 12, in which case A centered recording and holder is ensured by the defined clipboard (cf. Figure 10 ).

The plate part 1 is then transferred to the concrete base 2 by means of the handling machine 12 (see Figure 11 ).

In order to produce a centered arrangement of plate part 1 and concrete base 2 here too, the handling device 14 is provided with centering strips 26 having contact fingers 27. Two pairs of centering strips 26 are preferably provided, with the centering strips 26 of a pair preferably being arranged opposite one another.

At least the centering strips 26 of a pair are coupled to one another in terms of movement, so that a synchronized displacement of the strips can be achieved. As in Figure 5 The following can be shown schematically Strips of a pair have, for example, toothed push rods 28, which can be moved synchronously linearly from the outside to the inside and vice versa via a common central drive 29. The further pair of strips can, for example, be driven linearly via handlebars 30 and a central, drivable actuating element 31 in the same way as the other pair, with their direction of displacement (double arrow m) being perpendicular to the direction of displacement (double arrow n) of the other pair of strips.

The holding device 14 is preferably held in a central area, in which, for example, a drive axle 32 for the actuating drive of the centering strips 26 runs, so that the centering strips 26 can be displaced relative to the holding device 14.

The holding device 14 is preferably initially in a basic orientation, for example according to Figure 10 held, which basic position can be further secured, for example, by a releasable detent or coupling.

After a corresponding movement of the handling machine 12 in the direction of the concrete base 2 and then the lowering movement in the direction of the top 3 provided with the adhesive layer 10, the contact fingers 27 of the centering strips 26 are extended outwards in the corresponding position - viewed perpendicular to the vertical axis x the edge edges 35 of the top 3 are guided downwards, initially at a lateral distance from the edge sides 4 of the concrete base 2 (cf. Figure 12 ).

When the drive 29 is activated, the centering strips 26 are displaced synchronously towards one another, so that they are against the facing edge side 4 kick. If the concrete base 2 is not exactly aligned and positioned on the receiving plate 8 - with reference to a pair of centering strips - initially only one centering strip 26 can possibly be used as shown in Figure 13 step against the edge side 4 facing it, while the opposite centering bar 26 is still at a distance from the edge side 4 facing it.

As a result of the one centering bar 26 resting on the associated edge side 4 and the drive provided, the holding device 14 pulls together with the opposite centering bar 26 in the direction of the attached bar until the initially still free centering bar 26 also comes into contact with the facing edge side 4 of the Concrete base 2 occurs (cf. Figure 14 ). As can be seen, the holding device 14 is offset with its holding section 17 in the holding receptacle 18 of the support head 16.

The holding device 16 and thus the plate part 1 held centered on it is now aligned centered on the concrete base, so that by further lowering the holding device 14 or the entire automatic handling machine 12, the plate part 1 can be placed on the adhesive layer 10 after the negative pressure has been removed (cf. Figure 15 ).

When the plate part 1 is placed on the adhesive layer 10, the adhesive layer 10 can possibly be evened out solely by the weight of the plate part 1. The adhesive can then optionally extend to the respective edge 34, 35 of the concrete base 2 or the plate part 1, as shown schematically in Figure 17 is shown.

In the illustrations, the adhesive layer 10 is shown in an exaggerated manner.

After placing the plate part on the adhesive layer 10, further centering can also preferably be carried out using the centering strips 26. The centering strips 26 are then, when the plate part 1 has been released from the holding device 16 and is already resting on the concrete base, still overlapping the edge sides 4 of the concrete base 2 in the height direction and can then be relative to the placed plate part 1 a second time by a corresponding repeat procedure center to the concrete base 2 using an appropriate procedure.

A favorable adhesive setting is achieved in a preferred embodiment in that the adhesive application, as well as the placement of the plate part 1, is carried out when the concrete base 2 has not yet completely set. Accordingly, when the adhesive layer 10 is applied, the concrete base 2 still has a moisture content that favorably supports the reaction properties of the applied, silane-based adhesive.

The adhesive connection between the plate part 1 and the concrete base 2 can also be supported by a pressing process. For this purpose, for example, a stamp 33 acts flatly on the visible side 13 of the plate part 1, so that while supporting the concrete base 2, for example on the receiving plate 8, a contact pressure F acts on the adhesive bond, preferably perpendicular to the surface extent of the visible side 13. In an alternative embodiment, the force can also be achieved using the automatic handling machine 12, and if necessary under the influence of the holding device 14.

Finally, the composite of plate part 1 and concrete base 2 can be fed to a drying device, for example a drying chamber.

By means of the method described, a number A of ten or more concrete bases 2 provided with plate parts 1 can be produced in series (also, but not exclusively) using an automatic handling machine 12, taken directly from a successive production, in which the edge edges 34 of the centered plate part 1 with a circumferentially the same or the same distance p viewed at right angles to the edge sides 4 and / or aligned with the edge edges 35 of the concrete base 2, the possible distance p preferably not exceeding two millimeters (see also the highly enlarged magnifying glass illustrations in Figure 19 ).

In this case, so much adhesive is preferably applied to the top 3 of the concrete base 2 that in the hardened adhesive bond of the concrete base 2 and plate part 1, the area covered by the plate part 1 on the top 3 is covered by 80% or more, with the thickness d the adhesive layer 10 in the hardened adhesive bond can be 5 mm or less, depending on the surface properties of the concrete base top 3 in particular, but also the underside of the panel part, up to zero millimeters.

With regard to the support head 16 and an alignment of the holding device 14 to the support head 16 in order to achieve a defined starting position for a subsequent process of applying a plate part to the concrete base, as in Figure 4 Also shown schematically, a centering element 36 may be provided in the support head 16, which can cooperate with a centering recess 37 in the holding device 14. After the plate part has been placed on the concrete base, the centering element 36, which can be wedge-shaped on the front side as shown, associated with the support head 16, can be moved, for example by an electric motor or by a piston / cylinder arrangement 38, in such a way that it is in the Centering recess 37 of the holding device 14 retracts and thereby centers the holding device 14 back into a starting position relative to the support head 16.

Several such centering devices can be provided.

The above statements serve to explain the inventions covered by the application as a whole, which independently develop the prior art at least through the following combinations of features, whereby two, more or all of these combinations of features can also be combined, namely:

A plate part 1, which is characterized in that the concrete base 2 has a density of 0.8 kg/dm ³ or more, with the adhesive layer 10 having an amount of 400g/m ² or more, up to 1300 g/m ² , and wherein the adhesive is further silane modified.

A plate part 1, which is characterized in that the adhesive layer 10 covers the area covered by the plate part 1 on the concrete base 2 by 80% or more.

A plate part 1, which is characterized in that the adhesive layer 10 has a thickness d of less than 5 mm up to 0.5 mm.

A plate part 1, which is characterized in that the plate part 1 consists of a ceramic material or a plastic material.

A plate part 1, which is characterized in that the plate part 1, which has a rectangular or square plan, sits centered on the concrete base 2, which is rectangular or square in plan, in such a way that, in a plan view, the edge edges 34, 35 of the plate part are aligned all around 1 and the concrete base 2 is given or an alignment with a circumferentially the same distance p of the edge edges 34, 35, the edge edges 34 of the plate part 1 being set back relative to the edge edges 35 of the concrete base 2.

A number A, which is characterized in that the plate part 1 is centered relative to the concrete base 2 in such a way that in all of the above-mentioned mass-produced concrete bases 2 with adhesively connected plate parts 1 sitting on them, there is a rectangular distance p between the edge edges 34, 35 of the plate parts 1 and the concrete base does not exceed 2 2/10 mm.

A number A, which is characterized in that the number A of the plate parts 1 and concrete base 2 is taken from production that took place directly one after the other.

A method which is characterized in that the plate part 1 is detected with an automatic handling machine 12 in such a way that a centered alignment of the plate part 1 to a holding device 14 of the automatic handling machine 12 is achieved, that the concrete base 2 is placed on a movable receiving plate 8 at a predetermined point Location of the receiving plate 8 is formed that the receiving plate 8 is moved with the concrete base 2 into an assembly position in which the plate part 1 is placed on the concrete base 2 is, and that further the holding device 14 of the handling machine 12 is aligned with the actual position of the concrete base 2 before placing the plate part 1.

A method characterized in that the holding device 14 is designed as a negative pressure holding device.

A method which is characterized in that the holding device 14 can be released in the automatic handling machine 12 and is horizontally displaceable relative to a support head 16 of the handling machine 12 and/or can be rotated about a vertical axis x.

A method which is characterized in that two opposite centering strips 26 are attached to the holding device 14, which can be moved towards one another and thereby the alignment of the plate part by resting on one or both edge sides 4 of the concrete base 2 when the displaceability and / or rotation is triggered 1 at the actual position of the concrete base 2.

A method characterized in that two pairs of centering bars 26 are provided which are movable perpendicular to each other.

All features disclosed are essential to the invention (individually, but also in combination with one another). The disclosure content of the associated/attached priority documents (copy of the prior application) is hereby fully included in the disclosure of the application, also for the purpose of including features of these documents in the claims of the present application. The subclaims characterize, even without the features of a referenced claim, with their features independent inventive developments of the prior art, in particular in order to make divisional applications based on these claims. The invention specified in each claim may additionally have one or more of the features provided in the above description, in particular with reference numbers and/or in the list of reference numbers. The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular to the extent that they are clearly dispensable for the respective intended use or can be replaced by other technically equivalent means. List of reference symbols 1 Ceramic plate 29 drive 2 Concrete base 30 Handlebars 3 Top 31 Control element 4 edge side 32 Drive axle 5 shape 33 Rubber stamp 6 concrete 34 edge edge 7 Knocking device 35 edge edge 8th Recording plate 36 Centering element 9 Adhesive application device 37 Centering recess 10 adhesive layer 38 Piston/cylinder arrangement 11 edge 12 Automatic handling machine a Edge length 13 visible side b Edge length 14 Holding device c Distance 15 Centering platform d thickness 16 carrying head e Width 17 Bracket section f Distance 18 Bracket mount G Double arrow 19 Bracket head H Double arrow 20 Feather k Double arrow 21 Negative pressure area m Double arrow 22 Hose n Double arrow 23 inclined surface p Distance 24 Great r Arrow 25 Margin border 26 Centering bar A Number 27 investment finger E Horizontal plane 28 push rod F contact force Ka Final adhesive bead v stock M Assembly station Z Piston/cylinder arrangement P1 Point P2 Point α angle P3 Point P4 Point P5 Point P6 Point P7 Point

Claims (12)

Plate part (1) adhesively bonded to a compacted concrete base (2), characterized in that the concrete base (2) has a density of 0.8 kg/dm ³ or more, the adhesive layer (10) having a quantity of 400g/m ² or more, up to 1300 g/m ² , and furthermore the adhesive is silane-modified. Plate part according to claim 1, characterized in that the adhesive layer (10) covers the area covered by the plate part (1) on the concrete base (2) by 80% or more. Panel part according to one of the preceding claims, characterized in that the adhesive layer (10) has a thickness (d) of less than 5 mm up to 0.5 mm. Plate part according to one of the preceding claims, characterized in that the plate part (1) consists of a ceramic material or a plastic material. Plate part according to one of the preceding claims, characterized in that the plate part (1), which has a rectangular or square plan, sits centered on the concrete base (2), which is rectangular or square in plan, in such a way that the edge edges are aligned all around, in a plan view (34, 35) of the plate part (1) and the concrete base (2) is given or an alignment with a circumferentially the same / same distance (p) of the edge edges (34, 35), the edge edges (34) of the plate part (1) are set back from the edge edges (35) of the concrete base (2). A number (A) of ten or more mass-produced concrete bases (2) with adhesively bonded plate parts (1) seated thereon, in particular plate parts (1) adhesively bonded to compacted concrete bases (2) according to one of claims 1 to 5, characterized in that the plate part (1) is centered relative to the concrete base (2) in such a way that in all of the above-mentioned mass-produced concrete bases (2) with adhesively bonded plate parts (1) sitting thereon, there is a rectangular distance (p) between the edge edges (34, 35). Plate parts (1) and the concrete base (2) does not exceed 2/10 mm. Number according to claim 6, characterized in that the number (A) of plate parts (1) and concrete base (2) is taken from production that took place directly one after the other. Method for producing a concrete base (2) adhesively bonded to a plate part (1), the concrete base (2) first being produced with an upper side (3), an underside and edge sides (4), then onto the upper side (3) of the concrete base ( 2) Adhesive is applied and then the plate part (1) is placed centered on the concrete base (2), with each plate part (1) being individually centered on each concrete base (2), characterized in that the plate part (1) with is detected by an automatic handling machine (12), such that a centered alignment of the plate part (1) to a holding device (14) of the automatic handling machine (12) is achieved, so that the concrete base (2) is placed on a movable receiving plate (8) at a predetermined location the receiving plate (8) is formed, that the receiving plate (8) is moved with the concrete base (2) into an assembly position in which the plate part (1) is placed on the concrete base (2), and that further the holding device (14) of the handling machine (12) is aligned with the actual position of the concrete base (2) before placing the plate part (1). Method according to claim 8, characterized in that the holding device (14) is designed as a vacuum holding device. Method according to one of claims 8 or 9, characterized in that the holding device (14) can be released in the automatic handling machine (12) and is horizontally displaceable relative to a support head (16) of the handling machine (12) and/or can be rotated about a vertical axis (x). . Method according to one of claims 8 to 10, characterized in that two opposite centering strips (26) are attached to the holding device (14), which can be moved towards one another and thereby rest on one or both edge sides (4) of the concrete base (2). When the displacement and/or rotation is triggered, the plate part (1) can be aligned with the actual position of the concrete base (2). Method according to one of claims 8 to 11, characterized in that two pairs of centering strips (26) are provided which can be moved perpendicularly to one another.

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